Given the relations employee (name, salary, deptno) and department (depino, deptname, address)
Which of the following queries cannot be expressed using the basic relational algebra operations $$(U,-,x,\pi,\sigma,p)$$

A

Department address of every employee

B

Employees whose nameis the same as their department name

C

The sum of all employees’ salaries

D

All employees of a given department